from django.conf import settings
from django.db import OperationalError, ProgrammingError
from django.utils.safestring import mark_safe
from django.templatetags.static import static

from .models import PageTitle, SiteBranding


def site_branding(request):
    """Expose editable branding and the title configured for the current route."""
    try:
        branding = SiteBranding.load()
        route_name = getattr(getattr(request, "resolver_match", None), "view_name", "") or ""
        configured = PageTitle.objects.filter(route_name=route_name, is_active=True).values_list("title", flat=True).first()
    except (OperationalError, ProgrammingError, RuntimeError):
        branding = SiteBranding()
        configured = None
    developer_credit = (
        mark_safe(branding.developer_credit_html)
        if branding.use_developer_credit_html and branding.developer_credit_html.strip()
        else branding.developer_credit_text
    )
    staff_sidebar_credit = (
        mark_safe(branding.staff_sidebar_credit_html)
        if branding.use_staff_sidebar_credit_html and branding.staff_sidebar_credit_html.strip()
        else branding.staff_sidebar_credit_text
    )
    def asset_url(field, fallback):
        try:
            return field.url if field else static(fallback)
        except (ValueError, OSError):
            return static(fallback)
    branding_version = str(int(branding.updated_at.timestamp())) if branding.pk and branding.updated_at else "default"
    return {
        "site_branding": branding,
        "page_title": configured or branding.site_title,
        "developer_credit": developer_credit,
        "staff_sidebar_credit": staff_sidebar_credit,
        "branding_version": branding_version,
        "company_logo_url": asset_url(branding.company_logo, "images/company-logo.png"),
        "favicon_url": asset_url(branding.favicon, "images/favicon.ico"),
        "pwa_icon_url": asset_url(branding.pwa_icon, "images/pwa-icon.png"),
    }


def static_asset_version(request):
    """Change frontend and worker versions whenever static files or templates change."""
    roots = (settings.BASE_DIR / "static", settings.BASE_DIR / "templates")
    mtimes = (path.stat().st_mtime_ns for root in roots if root.exists() for path in root.rglob("*") if path.is_file())
    return {"static_asset_version": str(max(mtimes, default=0))}


def staff_operations_access(request):
    """Expose unit-scoped navigation capabilities without hardcoded roles."""
    user = request.user
    if not getattr(user, "is_authenticated", False) or getattr(user, "account_type", "") != "STAFF":
        return {}
    from apps.tickets.policies import TicketPolicy
    from apps.tickets.staff_conversation import unread_shares
    memberships = list(user.unit_memberships.filter(is_active=True, unit__is_active=True).select_related("unit"))
    def allowed(permission):
        return user.is_superuser or user.has_perm(permission) or any(TicketPolicy.has_unit_permission(user, item.unit, permission) for item in memberships)
    return {"staff_unread_shares": unread_shares(user), "staff_operations_access": {
        "create_ticket": user.has_perm("tickets.add_ticket") or allowed("tickets.add_ticket"),
        "contacts": True,
        "contact_groups": allowed("customers.view_contactgroup") or allowed("customers.add_contactgroup"),
        "dispatches": any(allowed(permission) for permission in ("tickets.create_bulk_dispatch", "tickets.create_inquiry", "tickets.dispatch_group_tickets", "tickets.view_all_bulk_dispatches", "tickets.view_all_inquiries")),
        "templates": allowed("notifications.view_smstemplate") or allowed("notifications.add_smstemplate"),
        "audit": user.has_perm("accounts.view_all_magic_links") or allowed("accounts.view_ticketmagiclink"),
    }}